HIVE-5706 - Move a few numeric UDFs to generic implementations (Xuefu Zhang via Brock Noland)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1546157 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5704 - A couple of generic UDFs are not in the right folder/package (Xuefu Zhang via Brock Noland)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1546161 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4485 : beeline prints null as empty strings (Thejas Nair reviewed by Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1546199 13f79535-47bb-0310-9956-ffa450edef68